From patchwork Wed Apr 20 19:44:08 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shirley Ma X-Patchwork-Id: 92295 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id A4FD81008D2 for ; Thu, 21 Apr 2011 05:44:33 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755845Ab1DTToR (ORCPT ); Wed, 20 Apr 2011 15:44:17 -0400 Received: from e5.ny.us.ibm.com ([32.97.182.145]:58328 "EHLO e5.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755807Ab1DTToQ (ORCPT ); Wed, 20 Apr 2011 15:44:16 -0400 Received: from d01relay05.pok.ibm.com (d01relay05.pok.ibm.com [9.56.227.237]) by e5.ny.us.ibm.com (8.14.4/8.13.1) with ESMTP id p3KJI6MY020526; Wed, 20 Apr 2011 15:18:06 -0400 Received: from d01av01.pok.ibm.com (d01av01.pok.ibm.com [9.56.224.215]) by d01relay05.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p3KJiE51122280; Wed, 20 Apr 2011 15:44:15 -0400 Received: from d01av01.pok.ibm.com (loopback [127.0.0.1]) by d01av01.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p3KJiAJj032327; Wed, 20 Apr 2011 15:44:11 -0400 Received: from [9.65.196.155] (sig-9-65-196-155.mts.ibm.com [9.65.196.155]) by d01av01.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id p3KJi8Z7032199; Wed, 20 Apr 2011 15:44:09 -0400 Subject: [PATCH V3 2/8] Add a new zerocopy device flag From: Shirley Ma To: David Miller Cc: mst@redhat.com, Eric Dumazet , Avi Kivity , Arnd Bergmann , netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <1303328216.19336.18.camel@localhost.localdomain> References: <1303328216.19336.18.camel@localhost.localdomain> Date: Wed, 20 Apr 2011 12:44:08 -0700 Message-ID: <1303328648.19336.24.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 (2.28.3-1.fc12) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This zerocopy flag is used to support device DMA userspace buffers. Signed-off-by: Shirley Ma --- include/linux/netdevice.h | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 0249fe7..0998d3d 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1067,6 +1067,9 @@ struct net_device { #define NETIF_F_RXHASH (1 << 28) /* Receive hashing offload */ #define NETIF_F_RXCSUM (1 << 29) /* Receive checksumming offload */ +/* bit 29 is for device to map userspace buffers -- zerocopy */ +#define NETIF_F_ZEROCOPY (1 << 29) + /* Segmentation offload features */ #define NETIF_F_GSO_SHIFT 16 #define NETIF_F_GSO_MASK 0x00ff0000